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An illustration of rev-list --parents --pretty=raw

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This script creates two separate histories, A and B, each of
which does:

      (A0, B0): create fileA and subdir/fileB
      (A1, B1): modify fileA
      (A2, B2): modify subdir/fileB

and then grafts them together to make B0 a child of A2.  So
the final history looks like (time flows from top to bottom):

		true parent	touches subdir?

	A0	none		yes (creates it)
        A1      A0		no
        A2	A1		yes
        B0	none		yes (different from what's in A2)
        B1	B0		no
        B2	B1		yes

"git rev-list --parents --pretty=raw B2" would give "fake"
parents on the "commit " header lines while "parent " header
lines show the parent as recorded in the commit object (i.e. B0
appears to have A2 as its parent on "commit " header but there
is no "parent A2" header line in it).

When you have path limiters, we simplify history to omit
commits that do not affect the specified paths.

So "git rev-list --parents --pretty=raw B2 subdir" would return
"B2 B0 A2 A0" (because B1 and A1 do not touch the path).  When
it does so, the "commit " header lines have "fake" parents
(i.e. B2 appears to have B0 as its parent on "commit " header),
but you can still get the true parents by looking at "parent "
header.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano 2006-09-27 12:34:37 -07:00
parent 4a0641b7cf
commit 16652170bf
1 changed files with 113 additions and 0 deletions
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113
t/t6001-rev-list-graft.sh Executable file
View File

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#!/bin/sh
test_description='Revision traversal vs grafts and path limiter'
. ./test-lib.sh
test_expect_success setup '
mkdir subdir &&
echo >fileA fileA &&
echo >subdir/fileB fileB &&
git add fileA subdir/fileB &&
git commit -a -m "Initial in one history." &&
A0=`git rev-parse --verify HEAD` &&
echo >fileA fileA modified &&
git commit -a -m "Second in one history." &&
A1=`git rev-parse --verify HEAD` &&
echo >subdir/fileB fileB modified &&
git commit -a -m "Third in one history." &&
A2=`git rev-parse --verify HEAD` &&
rm -f .git/refs/heads/master .git/index &&
echo >fileA fileA again &&
echo >subdir/fileB fileB again &&
git add fileA subdir/fileB &&
git commit -a -m "Initial in alternate history." &&
B0=`git rev-parse --verify HEAD` &&
echo >fileA fileA modified in alternate history &&
git commit -a -m "Second in alternate history." &&
B1=`git rev-parse --verify HEAD` &&
echo >subdir/fileB fileB modified in alternate history &&
git commit -a -m "Third in alternate history." &&
B2=`git rev-parse --verify HEAD` &&
: done
'
check () {
type=$1
shift
arg=
which=arg
rm -f test.expect
for a
do
if test "z$a" = z--
then
which=expect
child=
continue
fi
if test "$which" = arg
then
arg="$arg$a "
continue
fi
if test "$type" = basic
then
echo "$a"
else
if test "z$child" != z
then
echo "$child $a"
fi
child="$a"
fi
done >test.expect
if test "$type" != basic && test "z$child" != z
then
echo >>test.expect $child
fi
if test $type = basic
then
git rev-list $arg >test.actual
elif test $type = parents
then
git rev-list --parents $arg >test.actual
elif test $type = parents-raw
then
git rev-list --parents --pretty=raw $arg |
sed -n -e 's/^commit //p' >test.actual
fi
diff test.expect test.actual
}
for type in basic parents parents-raw
do
test_expect_success 'without grafts' "
rm -f .git/info/grafts
check $type $B2 -- $B2 $B1 $B0
"
test_expect_success 'with grafts' "
echo '$B0 $A2' >.git/info/grafts
check $type $B2 -- $B2 $B1 $B0 $A2 $A1 $A0
"
test_expect_success 'without grafts, with pathlimit' "
rm -f .git/info/grafts
check $type $B2 subdir -- $B2 $B0
"
test_expect_success 'with grafts, with pathlimit' "
echo '$B0 $A2' >.git/info/grafts
check $type $B2 subdir -- $B2 $B0 $A2 $A0
"
done
test_done